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Why should jobs write regular checkpoints?

The enhanced complexity of the new-generation supercomputers at JSC increases the probability that a job might be affected by a failure. Therefore, we strongly encourage all users of these systems to write regular checkpoints from their applications to avoid losses of CPU time when a job is aborted. There will be no refund of CPU time in the case of a failed job!

Tip: Besides checkpointing, jobs with a time limit of less than the maximum allowed hours might have a better turnaround time on JUQUEEN because they can be used to optimally fill the machine while it is being prepared for regular maintenance slots or full machine runs.